Despite the fact that the roof looks very simple, it belongs to complex structures. For this reason, even the smallest violation of technology leads to the fact that operation is accompanied by problems. Some of them are detected immediately, others - only after a while. However, the result is an initial violation of the sealing and the subsequent destruction of the roof. In order to ensure a comfortable microclimate in the house, it is necessary to properly equip the roofing cake, among which there is a vapor barrier.
The need for a vapor barrier
A vapor barrier for the roof is absolutely necessary, because a room for any purpose, whether it be a kitchen or a bathroom, involves the presence of a certain amount of water vapor. After formation, they rise up, penetrating into the space under the roof, where the insulation material is located. If you do not take appropriate measures, the thermal insulation will absorb moisture, which over time will certainly lead to destructive processes. This necessitates the use of a vapor barrier layer, which should be present in every roofing cake. Those owners of private houses who are going to save on purchasing a vapor barrier should know that its use allows you to get some advantages. Among them, we can distinguish the exclusion of the probability of decay and corrosion, which can occur during the interaction of metal and wood, as well as water vapor. If you use the described layer, then you can save on repair and maintenance of the roof system, which will not be exposed to aggressive moisture. Such measures will extend the life of the materials. Vapor barrier for the roof will cost less compared to repairing the roof and fighting fungus, as well as dampness that can occur in living rooms.
Vapor barrier materials
By visiting the building materials store, you can familiarize yourself with the assortment of special films designed to equip the vapor barrier layer. They are designed to perform one function, however, they have various properties and qualitative characteristics. The choice is made from waterproofing films, anti-condensation materials, as well as vapor-proof barriers. As for the first variety, it is used to exclude the ingress of steam into the insulation layer. Such a material has a special internal microperforated structure, which allows couples to pass into the outer space. The installation of this film must be carried out in such a way that it is removed from the roofing by the thickness of the elements of the crate. This gap allows air masses to circulate freely between the under-roof space, improving the quality of the vapor barrier.
Using such a material, you can be sure that it will provide one-sided permeability, while maintaining the dryness of structures and heat-insulating material.
Anti-condensation films
This vapor barrier for the roof has a fleecy fabric that is applied to the inner surface. The structure is able to retain moisture, excluding its draining on the insulation. The air circulation that occurs in the ventilation gaps contributes to the rapid weathering of moisture. Using this material, you can provide reliable vapor barrier, improving the quality of the insulation. When laying such a film, it is necessary to turn the adsorption layer to the inside of the living rooms. At the same time, the distance between the rafters should not be more than 1.2 meters. The layer is fixed to the counter grill with a slight ventilation gap.
Vapor barrier films
The vapor barrier for the roof with the help of such materials forms a kind of protective barrier, which is located on the inner side of the insulation layer. This film may have an aluminum reflex foil, which is used as an additional layer. It is positioned so that radiant energy is reflected inside the room. This allows you to achieve the effect of a thermos. The layer must be installed close to the insulation, providing a ventilation gap that eliminates the formation of condensate on the inside of the material. Such films not only perfectly protect the entire structure from moisture, but also reduce heat loss.
Material Selection Guide
If you will perform vapor barrier of the roof, the material must be selected before the start of work. In this case, attention should be paid to vapor permeability. This value is characterized by the speed at which the vapor pressure between two media separated by a film is compared. The more impressive the film has, the lower its vapor permeability. It is also important to consider the strength of the material. The more impressive the margin of safety, the more reliable the finished coating will be. If the insulation layer loses its original elasticity, this will lead to sagging, while vapor barrier will eliminate the destruction of the insulation, which is affected by gravity.
Fire safety and durability
Before the device for vapor barrier of the roof will be produced, you must take into account some of the characteristics that the described layer should have. Thus, it should be characterized by resistance to flame. This condition is necessary in order to guarantee fire safety. Among other things, pay attention to environmental friendliness. The basis should be ingredients that are safe for health. Pay attention to durability, the warranty period will determine the period during which it is absolutely not necessary to carry out repairs.
Installation
After you have chosen a vapor barrier for a flat roof, you need to familiarize yourself with the installation technology. The mentioned layer should be strengthened under the external finish on the inside of the roof. When arranging, it will be necessary to form a ventilation gap, the width of which is 5 cm. This will eliminate the effect of water on the ceiling decoration if there is increased humidity in the room. Vapor barrier and roof waterproofing should be overlapped. This must be taken into account when cutting material. One canvas should go on another 15 cm. Joints must be securely sealed with construction tape. The design features of the system will allow to determine whether to carry out one-sided or two-sided mounting.
Recommendations to the master
If you will be installing a vapor barrier under the roof, before cutting it is necessary to take into account seasonal fluctuations in temperature and humidity, which will have an effect on the layer. This indicates the need to fix the material without tension, the slack should be 2 cm. In those areas where the vapor barrier will adjoin the walls or the roof, it is necessary to make a thorough seal. On the perimeter, everything should be glued well. During installation, you need to use a building stapler, the brackets of which are installed in the rafter elements. Fastening should be carried out with the help of rails, this will exclude the possibility of water seeping into the insulation material.
Reviews on vapor barrier "Technonikol"
Today in the market of building materials vapor barrier for TechnoNIKOL roofing is widespread. Consumers respond very positively about it. According to professionals, its distinctive feature is the ability to maintain properties when external conditions are characterized by high humidity. Such a film shows its qualitative characteristics in the conditions of the Russian climate. This indicates that the material continues to fulfill its tasks in a wide temperature range, which varies from -40 to +80 degrees.
Reading the reviews, you will be able to understand that this material is very simple to install, its fastening can be done with nails with a wide hat, as well as a construction stapler. If you have to work in the space of insulated ceilings, then you need to put the canvas on the walls by 25 cm, making a thorough seal.
Conclusion
Installation of vapor barrier of the roof should be carried out strictly according to technology. For example, special attention must be paid to tightness, which is especially true for those places where the material is adjacent to the penetrating elements. Among the latter, ventilation ducts, chimneys, etc. can be distinguished. These rules must be taken into account and observed during the work, otherwise the means and forces will be wasted, and after some time the roof will require repairs, which will be time-consuming and costly. Experts recommend at least entrusting the calculation to professionals.